Feed-water heater for steam generators with a rotary water layer



Dec, 30. 1924. 1,521,502

J. V. BLOMQUIST ET AL FEED WATER HEATER FOR STEAM GENERATORS WITH A ROTARY WATER LAYER Filed Feb. 26, 1923 w 4 "w \r Q ,3 [fire/Wan? Jl/fiomgu/jv W ATFVVExfi/QJ Patented Dec. 36, 1924.

UNITED STATES 1,521,502 PATENT OFFICE.

JOHAN VIKTOR BLOMQUIST AND KARL FREDRIK WESSBLAD, OF STOCKHOLM, SWEDEN.

FEED-WATER HEATER- FOR STEAM GENERATORS WITH A ROTARY WATER LAYER.

Application filed February 26, 1923.

To all whom it may concern:

Be it known that we, JOIIAN VIKTOR BLOM- QUIS'I and KARL Fnnnnin IVEssBLAD, both citizens of Sweden, and residing at Stockholm, Sweden, have invented certain new and useful Improvements in Feedater Heaters tor Steam Generators with a Rotary ater Layer, of which the following is a specification.

Steam generators consisting of tubular elements containing rotary layers of water and in which the preheating of the feed water is carried out in separate "feed water heaters, while the steam is generated in the tubular elements, are affected with the disadvantage that steam might be generated in the preheaters and pass to the water inlet of the steam generators, thus causing the supply of teed water to the generators to cease. This disadvantage is eliminated by the present invention by carrying the steam that might be generated in the feed water heaters directly to the steam piping of the steam generators.

In such generators, as is well known, the controlling of the feed water supply, as well as the reading of the thickness of the rotary layer of water, is obtained by utilizing the difference in pressure, which, by the rotation and the resulting centrifugal force of the rotating water layer, is built up between the water inlet and the steam outlet and therefore it is absolutely necessary that an undisturbed supply of feed water be obtained and that no steam enter into the water inlet.

The invention is illustrated in the accompanying drawing in which Figs. 1 and 2 show two embodiments of the invention applied to a steam generator consisting of rotary tubular elements having a rotary layer of water, such as described and specified in the United States Patent 1,307,612, though the drawing, 101 the sake of clearness, shows one rotary tubular element only. It is however, to be understood that the invention also may be used in a similar manner for steam generators consisting of non-rotary tubular elements in which the layer of water is brought into rotation by means of a separate carrier device driven from the outside.

According to Fig. 1 the feed water is supplied to the feed water heater 2 through the pipe 1. The preheated feed water together with steam that might have been generated in the feed water heater is carried from the Serial No. 621,392.

latter through the pipe 3 into the member 4:.

'This member 4: is at its bottom connected with a water chest 5 common to all the rotary tubular elements, said water chest being connected with the water space of the tubular elements 7 by means of separate pipes 6. A drive pulley 7 is shown in Figure 1, connected to boiler element 7, whereby the element 7 is rotated. The steam spaces of the tubular elements are connected with a common steam chest 9 by means of separate pipes 8, from which steam chest the steam is carried to the place where it is to be used, through the pipe 10. The upper part of the member 4 is connected with the steam pipe 10 by means of a separate pipe 11. In the member a the water level 12 will stand higher or lower according to the thickness of the layer of water in the tubular elements on account of the action of the centrifugal force. The feed water supplied through the pipe 3 will. then fall down to this level while the steam that may pass through the pipe 3 is carried directly to the steam pipe 10 through the pipe 11. The supply of feed water to the rotary element 7 through the parts 4;, 5 and 6 will then take place undisturbed by such steam as may be enerated in the feed water heater 2.

In the form shown in Fig. 2 the feed water is supplied to the feed water heater 1a through the pipe 13. From the feed water heater the preheated feed water together with such steam as may be generated is carried through the pipe 15 into the water chest 16 common to all the rotary tubular elements, said chest being connected with the water spaces of the tubular elements 18 by means of separate pipes 17 The steam spaces of the tubular elements are connected with a common steam chest 20 by means of separate pipes 19. From this steam chest the steam is carried to the place, where it is to be used, by means of the pipe 22. The upper part of the water chest 16 is connected. with the steam pipe 22 by means of a separate pipe 28. In the steam pipe 22 a throttle is provided at 21 so that the steam pressure in the steam pipe 22 will be somewhat lower than the pressure in the rotary tubular element 18, whereby the feed water always will be caused to fill the water chest 16 and to maintain a level 24: in the pipe 23 that always is higher than the water chest. By giving the pipe 23 a sufficient height the surface of the Water is of the load of the boiler.

is in kept within the first vertical section of said pipe so that it cannot run away through the upper bend to the steam pipe, regardless The steam passing through the pipe will rise in the water chest 1.6 and pass to the steam pipe 22 through the pipe 23. The supply of the teedwater to the rotary tubular element through the parts 16 and 17 will then take place entirely undisturbed bv steam that may be generated in the feed water heater The arrangement and form of the piping,

e the water chest and steamchest etc. referred Water heater with the main feed water conto above may, of course, be carriedrout in difierentways, the principal feature of the invention being that an apparatus is pro- Vided in front of the water inlet of the steam generators propen'in which apparatus the steam that may be generated in the feedwater heater is separated and carried to the main-steam pipe through a separate pipe for the purpose of obtaining an undisturbed supply of water to the steam generators.

' 1; In combination, a steam generator comprising a tubular element, means for causing water in the element to form a hollow rotary layer of Water therein; a feed water heater. a feed Water inlet and a steam outlet in the opposite ends of the tubular, element, a main feed water conduit and'a main steam conduit connected to the feed Water inlet and the steam outlet respectively, a steam separator connecting the feed duit, and a steam pipe connectingthe top of M the steam separator with the main steam 7' conduit.

2. In combination, a steam generatorcomprising a tubularelement, means for causing water in the element to form a hollow rotary layer of water therein'and. a central adjusted to obtain a lower pressure in the said steam pipe andlthe steam separator than in the steam space of the tubular element, whereby to always insure that the main feed Water conduit always be full of I 7 water.

In testimony whereof, we have signed vour names to thls specification in the presence,

of two subscribing witnesses.

JOHAN VIKTOR BLOMQUIST. Witnesses: Y

E.. HoLzERMAN, FRED FLERoN. KARL FREDRIK WESSBLAD/ Witnesses: Mi MAR'rENssonfi TRESTON BLUMM. 

